From their press release:
Help Rebuild Oklahoma's School Libraries Buy a Book, Give a Book
In light of the horrible tornadoes that devastated the city of Moore, Oklahoma, Capstone Young Readers is lending its support to help the town recover and rebuild. For every book purchased on www.CapstoneYoungReaders.com, Capstone Young Readers will donate a book of equal value to help rebuild the school libraries in Moore, Oklahoma.
Simply enter the code MooreRelief in the promotion field when you checkout at www.CapstoneYoungReaders.com.
When the schools in Moore are ready to receive new books, Capstone Young Readers will send a shipment of books to fill the school libraries.